Merrimac Wastewater Treatment Plant
50 Federal Way, Merrimac, MA 01860 · Essex County · Publicly Owned Treatment Works
- Average flow
- 0.36 MGD
- Design flow
- —
- NPDES permit
- MAG580030
- Effective
- Permit expires
- November 2026
- Population served
- 3,993
- CWNS 2022
Merrimac Wastewater Treatment Plant is a publicly owned wastewater treatment works in Merrimac, Essex County, Massachusetts treating an average of 0.36 million gallons per day, serving about 3,993 residents. It discharges under NPDES permit MAG580030 (effective), which expires in November 2026, with 0 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Merrimac Wastewater Treatment Plant.
Available with a free Klarifi account
See the full treatment train at Merrimac Wastewater Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
3 verified contacts for Merrimac Wastewater Treatment Plant, with validated emails and direct phone numbers.
Unlock 3 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Merrimac Wastewater Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Massachusetts
Salisbury · 5 mi away
0.73 MGD
Newburyport · 7 mi away
1.52 MGD
Ipswich · 12 mi away
0.66 MGD
Manchester · 21 mi away
0.44 MGD
Salem · 22 mi away
21.66 MGD
Billerica · 22 mi away
3.3 MGD
Concord · 31 mi away
0.83 MGD
Winthrop · 33 mi away
270.96 MGD
Merrimac Wastewater Treatment Plant: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed October 26, 2026; facility record last updated November 7, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Tertiary treatment · Significant industrial user · all terms